Why must it be possible, or even easier? I honestly don't understand. There is no God given mandate that you shall be able to 3 star an equivalent base to yours.
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It only points one direction. Just attack from behind.
That's not always possible/optimal. E.g. for a max TH8, you can point it to blow over the ADs, weaken the side that it blows toward, and strengthen the side that is behind it. For a max TH8, that makes it even harder to take out the ADs, which is huge.
That said, from my experience, in most cases the air sweeper is not placed optimally, so it usually isn't hard to just hit it from behind. I actually had 2 bases in a row when I was farming with loonion where the air sweeper was just blowing over the exposed TH! What good is that! I took all their loot and left the TH standing.
Super skilled TH10 players can 3 star their mirror i have seen it done several times since the last update. At lower TH levels the skill to 3 star your mirror is progressively less but it still requires skill that in my experience the majority of clashers do not have!
Edit: I include myself as a player without the skill to regularly 3 star th10 bases in war, I have done it but its a very rare event! I am more of a 2 star pony which is enough in most clans to be considered a good attacker. At TH9 level though on my mini i can easily 3 star my TH9 mirror base in clan wars and i do this regularly with about a 75% success rate against max defence TH9
I'm glad that you agree with me! :p
The game is what SC make it. You get as many stars as you can get in war. The game is no harder or easier for the other player/team, so no matter what SC does it's a fair fight. The best team wins if they have the most stars, whether it's 100 stars or 10.
I agree with OP that land attacks should be given more boost at higher levels.
BUT
I think the airsweeper is not that OP at all, it just now allows you to funnel even air attacks that will be done to your base like what you do with walls and so defense has more control over where his opponent drops his air troops. I think its nice I would prefer this than them adding another AD - NOW THAT WOULD BE IMBALANCE!!!
A smart defender will cover the weaker side of the base.
I saw plenty fail attacks, when people somehow didnt see the air sweeper.